Not working The call for service message was on - after turning maching off and on now nothing happening. Do hear a low beep beep every so often. The screen shows a dot matrix of the copier and the screen.

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For this model specifically, the following will get you into service mode.
Hit "Clear / Stop" Buttom then "107" then hold down "color print" buttom for some sec then you are in service mode
If that doesn't work, you can also use Clear/Stop,1,0,7, Clear/Start.
Each key should be pressed and held until you hear a beep

The hard drive is not turned on. enter service mode ( utility, meter count, details, stop, 0, 0, stop, 0, 1 - this should be pressed in exact succession) then go to system 2 and look for a place where it asks you about all the installed perifferals. Turn the hard drive setting on.

this can happen if you install the cartridge incorrectly, i know sometime it seems you tried and feel that you have installed correctly but you must ensure that you put the ink properly, otherwise the sound that you hear is the indication that the printer is trying to go to its home position and trying to calibrate itself, unless otherwise this is corrected it will not stop from doing so. pls go to your service manual, and re check again

Try an nvramTry doing a hard or reset or nvram:1. Turn the printer off2. Hold down the right arrow and the cancel button3. Reboot the printer while holding the buttons and hold until permanent storage is displayed. Let go of the buttons and wait for the ready message on the display.

if this does not work contact hp, if within 2 years from the purchase date ask for a case number to have the printer serviced under a service note.

this happens during automatic color calibration, more than likely you need new color developer installed by a technician. turn machine on holding the 0&8 buttons to enter service mode type 4546 and 0 then start and 556 and 0 (start) 557 and 0 (start), then hold interrupt it will beep 5 times and shut down, this will turn off the calibration and allow you to make copies but will not improve quality.

C-2555 relates to a low toner density in the yellow imaging unit. I'm sure your daughter pressing buttons did not cause it.I suggest you release the yellow imaging unit (the bottow row of units)Just realease and pull it out a little way. Then switch the machine on with the door open. It won't start, but will ask you to shut the front door. Reseat the yellow imaging unit and shut the door. The machine should go in to a stabilization mode and then work.However, if it comes back, I suspect a new yellow imaging unit will be required.